G - Physics – 01 – R
Patent
G - Physics
01
R
324/21
G01R 31/00 (2006.01) G01R 31/327 (2006.01) H01H 9/16 (2006.01)
Patent
CA 1178659
GR-482 VITAL CONTACT CHECKING CIRCUIT ABSTRACT OF THE DISCLOSURE A vital contact checking circuit which senses the state of the back contact of a relay in either a dynamic or static situation. In the former, a signal is coupled from its source to a detector by a coupling means, such as a transformer, and an additional winding on the transformer is connected to the heel and back contact of the relay whose contact is being checked. When a circuit is established through the back contact the additional winding is short circuited, thereby preventing the signal from the source from reaching the detector and effectively eliminating it A variation of this scheme, also for use in a dynamic situation, involves using the coil structure in a resonant circuit, the sensing winding causing detuning when the back contact is closed so that again, the detector does not receive the signal from the source. For performing a vital check on a static contact, another scheme is utilized because a failure in-the oscillator or detector circuit of the schemes already described would give the same indication as a closed back contact. Therefore, the primary and secondary windings of the main transformer are wound on separate cores and the sensing winding links the individual cores so that the detector produces an output only if the sensed contact is indeed closed.
404302
Borden Ladner Gervais Llp
General Signal Corporation
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